Update on the ceiling motor as a pm alternator.
Dissapointing, loads of volts but minimal current, therefore very little power to be had.
It only cost me £15, so not a real problem.
I agree with Ghurds commemts over on the fieldlines forum.
I do not see them as worth the effort.
(metric to US, 0.18mm is about #34!)
"Fixing" the problems is more difficult than starting with a better motor.
Problems- Thin stator, huge resistance, no decent flux path 'behind' the magnets, not possible to configure in 3-ph (meaning it will cog with correctly placed magnets) , cheap bearings (usually), wire hardly large enough to see let alone work with, nearly impossible to reassemble correctly after the modifications...
And a 220V is worse than 110V in the resistance area.
Easier to start with an old box fan type motor, the kind with 6 coils.
The old furnace blower motors just like them, but 3~4X thicker, are a lot better.
Then just add 4 magnets and suitably separate the coils.
Tools required- hack saw, file, pliers, soldering iron.
Problems?- all I ever found had bushings.
Not perfect, but a LOT better.